Electric horn



July 4, 1944.

E. H. CHURCH ELECTRIC HORN-A Filed May 12. 1941 July 4, 1944- E. H.CHURCH I 2,352,602

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9 1 9 Il "HIIHIL /m WIM Patented July 4, 1944 ELECTRICYHORN' Eric H.Church, Desv Blaineswlnll., .assignor to Benjamin Electric Mfg. Company,"Des'Planes,

Ill., a corporation of Illinois Application May-12, 194i, serial No.392,999

My invention relates to electric horns. -One of the objects of myinvention is to produce an improved electric horn of the diaphragm andprojector type in which the electric control apparatus is so enclosed asto prevent aame which might result from an explosion within theenclosure from escaping from the enclosure and igniting any inflammablemixture which might exist in the immediate vicinity. A further object isto provide an improved adjustable mounting for the coil and cordfof theelectrical apparatus with respect to the armature.

'Further objects' and 'advantages will appear from the description andclaims. v

Ink the drawingslin which one embodiment of my invention is shown,

Figure 1 is an axial sectional View of an electric'horn on the linel-l'of Fig. 2; Fig. 2 is an axial sectional View substantially on theline 2-2 of Fig. l; Y

Fig. 3 is an axial sectional view substantially on the line 3-3 of Fig.1;

Fig. 4 is a bottom view of the horn, with the lower part of the casingor housing broken away.

Referring to the drawings in detail, the construction shown comprises adished housing I which may be a casting, a cover 2 for the housing, avibratable diaphragm 3, a projectorhorn 4, and an electrical apparatusmounted on the cover inside the housing for actuating the diaphragm. Theprojector horn, diaphragm, and electrical apparatus may all be mountedon the cover 2. A plug-in separable connector is pron Alln order toprevent any possibility of ignited gases or the like escaping from thehousing in the event of an explosion or the like within the housing, thecover is provided with a plug portion I3 having a tapering conicalmachine-finished surface for tting ,snugly= in a corresponding tapering,conical,V outwardly flaring, machinenishedentrance 'opening in thehousing. The

titi-.ing is made so accurately and the distance 6 claims. Miel. 177-;7)

from the inner point of contact Mito the outer point of contact l5betweenl the machine-finished surfaces issofgreatthat Vignited vgasescannot reach the atmosphere from the vinside ofl the housing. w

In order to clamp the plug part of the cover securely in lplace in theconical opening in the housing, a clamping ring I6 is provided having aninternally threaded skirt Vvportion Il threaded onto van externallythreaded portion of the housing. The inwardly extending flange of thisclamping ring may-engage anysuitable portion of the cover unit. Asshown, itengages the outer portion of the annular basev i8 of theprojector horn.k When the clamping ring is screwed down it forces thetapered plug portion i3 snugly into the tapering entrance opening in thehousing. The diaphragm and projector rhorn are secured to the cover bymeans of screws i9 extending through registering openings in the.projector horn, ilange.- and diaphragm and threaded into blind tappedholes Vin the cover. Due to the use of these blind tapped holes, thereisno possibility of ignited gases escaping at the point of connectionbetweenvthe cover 2 ,and the diaphragm and horn.

The electrical apparatus shown for operating the diaphragm comprises asingle coil winding 20, an E-shaped laminated core 2l about thecentralvarm 22 of which the coil extends, and an armature 23 alignedwith the lower edge of the core2l. This armature isvconnectedwith thediaphragm 3 by means of a plunger 24 threaded into the armature andextending through a long sleeve 25 on the cover. The sleeve has .asmooth bore with which the smooth outer surface of the plunger has asmooth slip iit'rso that the escape of ignited gases between the plunger24 andthe-cylindrical bore of the sleeve25 is pre'-y ventedj, The escapeis of course further hindered by the fact that the diaphragm 3i extendsacross the upper side of the cover and is provided with a steelring 26on one side thereof for effecting a seal. In order to position the'diaphragm and plunger 24 accurately, studs 26aare securedto the ring 2Gand extend through registering holes in the diaphragm 3 and intoregistering holes in the cover 2. A

The Vcentral arm of the 'E-shaped core hasV a central opening 21 intowhich theA elongated sleevev25 extends. thecover by means of a pair ofLeshaped'brackets 28 having wing portions 29 securedbyrivets 30 u to theouterY arms of the core 2| and having` foot This core is supported fromsupporting feet 3| are gripped. By means ofr this adjustment, Vthe gapbetween the armature justed position.

said enclosure, said cover having a sleeve portion having a long,smooth, cylindrical bore, and transmission between said electricalapparatus and diaphragm comprising a plunger having a smooth slip t insaid cylindrical bore.

` 3. An electric horn comprising a dished housing, a cover for saiddished housing forming therewith an enclosure, a diaphragm `mounted onsaid cover outsidesaid enclosure, a projector horn mounted outside saidenclosure, electrical .apparatus mounted on said cover inside saidenclosure for actuating said diaphragm, said dished and core may befinely adjusted and held infadling the coil circuit comprises a pair oicontacts 35 and 36 to which the wires 31 and 38 are connected,respectively, the contact 35`fbeing springvided for the contacts. Theconnections for the switch contacts comprise the two wires 3l and 38leading from the Contact blades to the switch contacts. It is desirableto provide a condenser 44 in parallel Vwith the switch bymeans of the`wires 45 and 46. The condenser has the elect of helping to snuff outthearc to neutralize the magnetic field quickly. Thehousing is providedwith the usual opening 4l for .connection with the conduit throughVwhich the feed wires eX- tcnd. The diaphragm 3 may be securedV to theThe upper Contact is controlled Vplunger 24 by means of a nut 48threaded onto a reduced extension of the plunger and extending throughan eyelet 49 riveted onto the diaphragm, which eyelet clamps the packingwashers 50 in place. f

Further modifications will be apparent to those skilled in the art, andit is-desired, therefore, that the invention be limited only by thescope of the appended claims.

Having thus described my invention, what I claim and desire to securelby Letters Patent is:

1. Ari electric horn comprising a dished housing, a cover for .saiddished housing forming therewith an enclosure, a diaphragm, electricalapparatus mounted on said cover-inside said `enclosure for actuatingsaid diaphragm, said diaphragm beingY mounted outside said enclosure andsaid vcover having an `opening.r-therethrough, and transmission fromsaid electrical apparatus to said ydiaphragm passing through said:opening, said cover having provision for hindering gas from passingfrom said enclosure lthrough said opening when an explosion rtakes:place in said enclosure .and having provisions for hindering the escapeof gas past the peripheral edge of the cover.

2. An electric horn comprising a dished 'housing, a cover for saiddished housing forming therewith an enclosure, .a-diaphragm,gelectr.ical apparatus mounted on-said cover inside ysaidenclosure for actuating saidv diaphragm, said diaphragm rbeing mountedV`on said coveroutside "conical,

`=housing having a tapering, conical, outwardlyflaring,machine-finished, entrance opening, said Acover yhaving a plugportionhaving a tapering', machine-iinished surface for fitting snugly in saidconical opening, and a clamping ring surrounding said horn and threadedonto said housing member for exerting pressure on said,v plug portion toforce it snugly into said conical opening.

V4.' An electric horn comprising a dishedA hous- .ingfa cover for said:dished housing forming therewith an enclosure, a diaphragm mountedoutside said enclosure, electrical apparatus Amounted on said coverinside said enclosure for actuating said diaphragm, said dished housinghaving a tapering, conical, outwardly-flaring, machine-finished,entrance opening, said cover having a plug portion having a tapering,conical, machine-i'inished surface for tting snugly in said conicalopening, and a clamping ring threaded onto said housing member forexerting pressure on .said plug portion to force it snugly intosaidconical opening, said diaphragm being clamped between saidv'ringandplug portion.

5. An electric horn comprising'adished housing, a` cover for said dishedhousing forming therewith an enclosure, 4a diaphragmmounted on saidcover outsidesaid enclosure, a projector horn mounted outside saidenclosure, electrical apparatus mounted .on Vsaid cover inside saidenclosure for'factuatingsaid diaphragm, said dished housing having atapering, conical, outwardlyflaring, machine-finished, entrance opening,said cover having a plug portion having a tapering, conical,machine-iinished Vsurface for fitting snugly insaid conical opening, anda clamping ring threaded onto saidhous'ing member for exerting pressureon said Aplug portion to force it snugly into said conical opening, saidprojector horn having a ange clamped between said ring andplug' portion.k l V a 6. 'An electric horn comprising a dished housing, a'cover forsaid dished housing yforrfr`1i'ng` therewith an enclosure, a .diaphragmvmounted outside said enclosure, a projector'horn' mounted outside lsaidenclosure' electrical apparatus mounted on said cover insideV saidenclosure for actuating said diaphragm, said dished housing havingartapering, conical, outwardly-haring, machine-finished, entranceopening, said cover having a plug portion having a tapering, conical,machine-finished surface for fitting snugly said conical opening, and aclamping ring threaded onto said housing member for exerting pressureonsaid plug portion to force it snugly into-said conical opening, `saidprojector horn having a flange -c`lam`ped"between said ring andplugportion andsaid 'diaphragm being clamped between said 'ring `andplug portion.

i ERIC .risc-:Huizen

